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17 KiB
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This file is part of Moodle - http://moodle.org/\n//\n// Moodle is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n//\n// Moodle is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n//\n// You should have received a copy of the GNU General Public License\n// along with Moodle. If not, see <http://www.gnu.org/licenses/>.\n\n/**\n * Enhancements to Bootstrap components for accessibility.\n *\n * @module theme_ilb/aria\n * @copyright 2018 Damyon Wiese <damyon@moodle.com>\n * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\n\nimport $ from 'jquery';\nimport Pending from 'core/pending';\n\n/**\n * Drop downs from bootstrap don't support keyboard accessibility by default.\n */\nconst dropdownFix = () => {\n let focusEnd = false;\n const setFocusEnd = () => {\n focusEnd = true;\n };\n const getFocusEnd = () => {\n const result = focusEnd;\n focusEnd = false;\n return result;\n };\n\n // Special handling for \"up\" keyboard control.\n document.addEventListener('keydown', e => {\n if (e.target.matches('[data-toggle=\"dropdown\"]')) {\n const trigger = e.key;\n\n // Up key opens the menu at the end.\n if (trigger == 'ArrowUp') {\n // Focus the end of the menu, not the beginning.\n setFocusEnd();\n }\n\n // Space key or Enter key opens the menu.\n if (trigger == ' ' || trigger == 'Enter') {\n // Cancel random scroll.\n e.preventDefault();\n // Open the menu instead.\n e.target.click();\n }\n }\n });\n\n // Special handling for navigation keys when menu is open.\n const shiftFocus = element => {\n const delayedFocus = pendingPromise => {\n element.focus();\n pendingPromise.resolve();\n };\n setTimeout(delayedFocus, 50, new Pending('core/aria:delayed-focus'));\n };\n\n $('.dropdown').on('shown.bs.dropdown', e => {\n // We need to focus on the first menuitem.\n const menu = e.target.querySelector('[role=\"menu\"]');\n let menuItems = false;\n let foundMenuItem = false;\n\n if (menu) {\n menuItems = menu.querySelectorAll('[role=\"menuitem\"]');\n }\n if (menuItems && menuItems.length > 0) {\n if (getFocusEnd()) {\n foundMenuItem = menuItems[menuItems.length - 1];\n } else {\n // The first menu entry, pretty reasonable.\n foundMenuItem = menuItems[0];\n }\n }\n if (foundMenuItem) {\n shiftFocus(foundMenuItem);\n }\n });\n // Search for menu items by finding the first item that has\n // text starting with the typed character (case insensitive).\n document.addEventListener('keypress', e => {\n if (e.target.matches('.dropdown [role=\"menu\"] [role=\"menuitem\"]')) {\n const menu = e.target.closest('[role=\"menu\"]');\n if (!menu) {\n return;\n }\n const menuItems = menu.querySelectorAll('[role=\"menuitem\"]');\n if (!menuItems) {\n return;\n }\n\n const trigger = e.key.toLowerCase();\n\n for (let i = 0; i < menuItems.length; i++) {\n const item = menuItems[i];\n const itemText = item.text.trim().toLowerCase();\n if (itemText.indexOf(trigger) == 0) {\n shiftFocus(item);\n break;\n }\n }\n }\n });\n\n // Keyboard navigation for arrow keys, home and end keys.\n document.addEventListener('keydown', e => {\n if (e.target.matches('.dropdown [role=\"menu\"] [role=\"menuitem\"]')) {\n const trigger = e.key;\n let next = false;\n const menu = e.target.closest('[role=\"menu\"]');\n\n if (!menu) {\n return;\n }\n const menuItems = menu.querySelectorAll('[role=\"menuitem\"]');\n if (!menuItems) {\n return;\n }\n // Down key.\n if (trigger == 'ArrowDown') {\n for (let i = 0; i < menuItems.length - 1; i++) {\n if (menuItems[i] == e.target) {\n next = menuItems[i + 1];\n break;\n }\n }\n if (!next) {\n // Wrap to first item.\n next = menuItems[0];\n }\n\n } else if (trigger == 'ArrowUp') {\n // Up key.\n for (let i = 1; i < menuItems.length; i++) {\n if (menuItems[i] == e.target) {\n next = menuItems[i - 1];\n break;\n }\n }\n if (!next) {\n // Wrap to last item.\n next = menuItems[menuItems.length - 1];\n }\n\n } else if (trigger == 'Home') {\n // Home key.\n next = menuItems[0];\n\n } else if (trigger == 'End') {\n // End key.\n next = menuItems[menuItems.length - 1];\n }\n // Variable next is set if we do want to act on the keypress.\n if (next) {\n e.preventDefault();\n shiftFocus(next);\n }\n return;\n }\n });\n\n $('.dropdown').on('hidden.bs.dropdown', e => {\n // We need to focus on the menu trigger.\n const trigger = e.target.querySelector('[data-toggle=\"dropdown\"]');\n if (trigger) {\n shiftFocus(trigger);\n }\n });\n};\n\n/**\n * After page load, focus on any element with special autofocus attribute.\n */\nconst autoFocus = () => {\n window.addEventListener(\"load\", () => {\n const alerts = document.querySelectorAll('[data-aria-autofocus=\"true\"][role=\"alert\"]');\n Array.prototype.forEach.call(alerts, autofocusElement => {\n // According to the specification an role=\"alert\" region is only read out on change to the content\n // of that region.\n autofocusElement.innerHTML += ' ';\n autofocusElement.removeAttribute('data-aria-autofocus');\n });\n });\n};\n\n/**\n * Changes the focus to the correct tab based on the key that is pressed.\n * @param {KeyboardEvent} e\n */\nconst updateTabFocus = e => {\n const tabList = e.target.closest('[role=\"tablist\"]');\n const vertical = tabList.getAttribute('aria-orientation') == 'vertical';\n const rtl = window.right_to_left();\n const arrowNext = vertical ? 'ArrowDown' : (rtl ? 'ArrowLeft' : 'ArrowRight');\n const arrowPrevious = vertical ? 'ArrowUp' : (rtl ? 'ArrowRight' : 'ArrowLeft');\n const tabs = Array.prototype.filter.call(\n tabList.querySelectorAll('[role=\"tab\"]'),\n tab => getComputedStyle(tab).display !== 'none'); // We only work with the visible tabs.\n\n for (let i = 0; i < tabs.length; i++) {\n tabs[i].index = i;\n }\n\n switch (e.key) {\n case arrowNext:\n e.preventDefault();\n if (e.target.index !== undefined && tabs[e.target.index + 1]) {\n tabs[e.target.index + 1].focus();\n } else {\n tabs[0].focus();\n }\n break;\n case arrowPrevious:\n e.preventDefault();\n if (e.target.index !== undefined && tabs[e.target.index - 1]) {\n tabs[e.target.index - 1].focus();\n } else {\n tabs[tabs.length - 1].focus();\n }\n break;\n case 'Home':\n e.preventDefault();\n tabs[0].focus();\n break;\n case 'End':\n e.preventDefault();\n tabs[tabs.length - 1].focus();\n break;\n case 'Enter':\n case ' ':\n e.preventDefault();\n $(e.target).tab('show');\n tabs.forEach(tab => {\n tab.tabIndex = -1;\n });\n e.target.tabIndex = 0;\n }\n};\n\n/**\n * Fix accessibility issues regarding tab elements focus and their tab order in Bootstrap navs.\n */\nconst tabElementFix = () => {\n document.addEventListener('keydown', e => {\n if (['ArrowUp', 'ArrowDown', 'ArrowLeft', 'ArrowRight', 'Home', 'End', 'Enter', ' '].includes(e.key)) {\n if (e.target.matches('[role=\"tablist\"] [role=\"tab\"]')) {\n updateTabFocus(e);\n }\n }\n });\n\n document.addEventListener('click', e => {\n if (e.target.matches('[role=\"tablist\"] [role=\"tab\"]')) {\n const tabs = e.target.closest('[role=\"tablist\"]').querySelectorAll('[role=\"tab\"]');\n e.preventDefault();\n $(e.target).tab('show');\n tabs.forEach(tab => {\n tab.tabIndex = -1;\n });\n e.target.tabIndex = 0;\n }\n });\n};\n\nexport const init = () => {\n dropdownFix();\n autoFocus();\n tabElementFix();\n};\n"],"file":"aria.min.js"}
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